package edu.yuhf.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


@WebFilter("/views/*")
public class SessionCheckFilter implements Filter {

	public void destroy() {
	}

	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request=(HttpServletRequest)req;
		HttpServletResponse response=(HttpServletResponse)res;
		HttpSession session=request.getSession();
		if(null==session.getAttribute("user")){
			response.sendRedirect(request.getContextPath()+"/login.jsp");
		}
		chain.doFilter(request, res);
	}

	public void init(FilterConfig fConfig) throws ServletException {
	}

}
